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INTERMEDIATE LEVEL
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dark, black clouds ☊ 
mây đen ☊
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The dark clouds in the sky meant that a storm was coming. ☊ dark ☊
The sky was full of dark masses of clouds. ☊ mass ☊
The dark clouds matched her mood. ☊ match ☊
Clouds of thick black smoke billowed from the car's exhaust. ☊ smoke ☊